Negative Terminal - Page 2 - Subaru Outback - Subaru Outback Forums
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post #11 of 25 (permalink) Old 06-24-2015, 11:18 PM
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I haven't jump started cars with my car since 1993. There's just too much that can go wrong. With all the complex electronics that control a car now days, you're asking for trouble every time you jump start another car. That's why I carry a power pack. So I can help others, and if I ever need a jump, I have it with me.


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post #12 of 25 (permalink) Old 06-25-2015, 01:49 AM
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Originally Posted by AvidHiker View Post
In my very limited experimentation, I have noticed some unusual voltages from one of the head unit service modes, but, so far, mostly lower voltages than I would expect to see with the alternator running ...
I typically see ~12.0 volts fairly often, especially when accelerating, which indicates that the car is probably running off battery only during those times. It actually surprises me to regularly see anything below 12.6 volts, but it's probably another part of the fuel economy strategy. When cruising in moderate temperatures, the most common system voltage I observe is ~12.6 volts ... which is about right for a healthy, fully-charged lead-acid automotive battery.

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Or oil pressure...
The 2015 Legacy/Outback does not have an oil pressure sensor ... only a low-pressure switch.


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post #13 of 25 (permalink) Old 06-25-2015, 10:10 AM
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@AvidHiker
Thanks for the heads up on how to get into this feature. Why in the world wouldn't Subaru just make it simple, like a button or app... How about making the vehicle monitor just that, instead of a pic of the drivetrain, accelerator position, and oil temp gauge. How about making the display adjustable so you can have the oil temp, voltage, axle temp together. Or oil pressure... Dang! they almost got it right...

Sure, thanks to @onever for digging it up. The person responsible for programming this head unit definitely lacks common sense. The vehicle monitor display could be so much better.


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I typically see ~12.0 volts fairly often, especially when accelerating, which indicates that the car is probably running off battery only during those times. It actually surprises me to regularly see anything below 12.6 volts, but it's probably another part of the fuel economy strategy. When cruising in moderate temperatures, the most common system voltage I observe is ~12.6 volts ... which is about right for a healthy, fully-charged lead-acid automotive battery...
Sounds similar to what I observed this morning on my 15 mile drive to work (average speed of maybe 40). Any time I gave it a decent amount of gas, the voltage dropped briefly to around 12V. But when idling, coasting or simply maintaining speed, I consistently saw 14.2V.
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post #14 of 25 (permalink) Old 06-27-2015, 10:54 PM
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why didn't they cover the negative terminal?...it looks so unfinished exposed under the hood
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post #15 of 25 (permalink) Old 06-28-2015, 04:29 AM
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why didn't they cover the negative terminal?...it looks so unfinished exposed under the hood

Argh...


I see also many other components, there shoud be another hood, under the hood.
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post #16 of 25 (permalink) Old 08-04-2018, 06:20 PM
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Old thread wake up...

Quote:
Originally Posted by AvidHiker View Post
@ammcinnis
That's very interesting. In my very limited experimentation, I have noticed some unusual voltages from one of the head unit service modes, but, so far, mostly lower voltages than I would expect to see with the alternator running:
To enter:
Hold "HOME" and press the "Audio/Tune" knob 5 times
Then, to display battery voltage, select "Function Check/Setting" > "Vehicle Signal"
To exit:
Hold "HOME" and press "<<" repeatedly until the system reboots
Thanks. This works for me about 1 out of 10 times I try it in my 2018 Subaru Outback 2.5 Limited. I wonder if there is something else to those instructions that will make the access more consistent.
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post #17 of 25 (permalink) Old 08-04-2018, 06:35 PM
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FYI, several months ago Subaru released a revised battery charging routine for 2015-17 vehicles that only take short trips. It seems the battery was not getting charged properly. Believe the revised charge routines were built into the 2018, not sure

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post #18 of 25 (permalink) Old 08-04-2018, 07:54 PM
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FYI, several months ago Subaru released a revised battery charging routine for 2015-17 vehicles that only take short trips. It seems the battery was not getting charged properly. Believe the revised charge routines were built into the 2018, not sure
Yes, I think they have. I am just tinkering out of curiosity. I am not having battery issues.
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post #19 of 25 (permalink) Old 08-04-2018, 09:16 PM
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Originally Posted by asiandude View Post
why didn't they cover the negative terminal?...it looks so unfinished exposed under the hood
I agree. Seeing that terminal reminds me that it is a battery. I even cover the bone in my TBone with a napkin whilst eating it.
I can't stand to look at it, as it reminds me what I am actually eating: Dead cow.
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post #20 of 25 (permalink) Old 08-05-2018, 02:20 PM
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Originally Posted by jakemccoy View Post
Thanks. This works for me about 1 out of 10 times I try it in my 2018 Subaru Outback 2.5 Limited. I wonder if there is something else to those instructions that will make the access more consistent.
That appears to be the correct method for the 2015 HU with NAV, but I'm not finding anything specific to the 2018 model. Attaching a screen grab from a firmware update TSB for my HU (which also applied to the 2016 model)...

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